Burglar-alarm.



W. D. IVIOTT L L. VAN BROWN.

BUHGLARALARM.

APPLICATION. FILED JAN. 3|. 1916.

Patented Feb. 12, 1918.

2 SHEETS-SHEET l.

WVM/1120900 j 1. J i /ffmyec-s vv. n. MOH L. VAN BROWN.

BURGLAR ALARM.

APPLICATION FILED JAN31| 19H5.

2 SHEETS-SHEET 2.

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alkyl/neg 4e' E a entre sanas l.amener erstes.

WILLIAM D. MOTT AND LEWIS VAN BROWN, 0F ASHEVILLE, NORTH CAROLINA.

BURGLAR-ALARM.

Application filed January 31, 1916.

To aZZ whom t may concern:

y Be it known that we, WILLIAM D. MoT'r and Lnwrs VAN BROWN, citizens of the United States, residing at Asheville, in the county of Buncombe and State 'ot' Northv kof a burglar alarm, primarily designed for use in connection with a movable member, such as a door, window, or the like,'and constructed to automatically operate to sound an alarm when said movable member is adjusted from its normal position.

in carrying out the invention we provide a means for rendering the alarm mechanism inoperative when desired, to permit the movable member to be opened and closed at will without a sounding of the alarm.

The nature and advantages of the invention will be better understood as the following description is read in connection with the accompanying drawings, the invention residing in the novel construction, combination and arrangement of parts as claimed.

In the drawings forming part ot' this'application like numerals ot' reference indicate similar parts throughout the several views and wherein:-

Figure l is a fragmentary sectional plan view oi the door showing the device applied.

F ig. 2 is a front view partly broken away.

Fig. 3 is a section taken on line 3-3 of Fig. 2. x

fig. 4 is a section taken on line 4--1 of g. y3'. Fig. 5 is a view similar to Fig. 1 showing a modified form.

Fig. is a view similar to Fig. 2 showing the modification.

Fig. 7 is a view showing in detail several elements of the mechanism.

Referring more particularly to the drawings 10 indicates generally an audible signal, preferably a bell of usual construction, wherein the alarm mechanism includes the escapement 11 with which the arm 1Q of the hammer 13 is connected. The mechanism Yfurther includes an adjustable pintle 1l having one end slidably fitted in the plate 15, and its opposite end projecting through the base 16 of the bell. The pintle 14 at a point in its length is provided with an enlargement 17 against which bears one end ot' an extensile spring 18, the opposite end bearing Specication of Letters Patent.

Patented Feb. 12, 1918.

Serial No. 75,456.

against the plate 15 and operating to normally hold the enlargement 17 of the pintle disposed in the path of movementjot' the arm 12, in which position of parts the alarm mechanism is rendered inoperative.

Secured to the base 1G is a limb 19 of a substantially L-shaped bracket plate, the opposite limb 2O terminating to provide a right angularly disposed flange, constituting a fixed jaw 21. Coperating with the jaw 21 is a relatively movable jaw 22 preferably consisting of a wooden block 23 slidably engaging the limb 9.0 of the plate, and having a metal binding strip 2% covering the eX- posed edges of the block and secured thereto in any suitable manner. The strip 24 terminates at both ends to provide hook-like portions 25 which embrace the opposite longitudinal edges of the limb 20 and serves as a guide for the movable jaw in'its adjustment toward and away from the ixedjaw 21. The movable jaw may be so adjusted in any suitable manner, however as shown in this particular instance use ismade of a screw 26 extended through a suitable opening in the limbl 19 of the bracket plate, and adjustably associated with a ixed nut 27 secured to the under side of the limb, the screw having one end swiveled within the block 23 and its opposite end provided with a knurled nut 2S for operating the screw in the proper direction to adjust the movable jaw toward and away from the fixed jaw 2l as the occasion may require. As shown in this instance the arm is clamped upon the edge of the door A, although it is susceptible for use in other connections, it being manifest that by reason of the adjustment of the fixed jaw 2'?. the device may accommodate itself to doors or the like of varying thickness.

Pivotally secured to the under side of the base 18 is one end of a lever 529 which bridges a resilient finger 30, the latter also having one end secured to the under side of the base 1G and its opposite end normally spaced from said base. and operatively associated n'ith the adjacent end of the pintle 14. The lever is arranged to slide in a suitable guide 31 which is constructed to limit the. adjustment of the lever in one direction. While the opposite end ot' the lever projects beyond the bracket whereby it may be easily grasped to adjust the same when desired. In the normal position of the lever 29 the llatter is slightly spaced from the iinger 30, in which position of parts the `spring 18 operates to maintain the enlarged portion -17 of' the pintle disposed in the path of movement of the arm l2 of the hammer,

thereby rendering the alarm mechanism in-v operative.

Vjautomaticallyoperate to give a signal when such movable member is adjusted from its normal posi-tion.

To carryvthis idea into effect use is made of an elongated member 32 slidably mounted upon the limb 19 of the bracket plate through a suitable guide 33, the member extendinfg through an elongated slot in the base 16 and terminating to provide a flange 34 tor engagement with the hammer arm 12. rlfhe ,opposite end ofthe member isl also formed to provide a flange 35 adjacent which a slot 3T 1s provided. A leaf spring 36, passes through a transverse slot V37 in said member for a purpose to .be presently described. The spring 36' is bowed outwardly and has its opposite end fixed in any suitable manner to the limb 20 of the bracket plate` and adapted' to operate Within aV longitudinally disposed groove 3:8 formed in the limb 20. By reason of the man-ner in which the. deivice in its entirety-is mounted upon the door as shown, it is manifest that as the door is swung to itsy closed position the spring 36 is brought into engagement with the door jamb B, and thereby straightened or moved into the groove 38. Asthe spring is straightened it operates upon the member 32 to move the.` latter into elective engagement with the hammer arm 12, thereby holding the latter Y immovable and rendering the alarm mechamsm inoperative. Of course When use of the. alarm mechanism is desired, and subseV` quent to. the closing of the door, so: that the parts will assume. the position hereinabove, mentioned, the lever29 is moved toward the free end of the finger 30, engaging and de,- pressing the latter,A thereby adjusting the. pintle. 2li against the tension of the spring 18, and moving-the enlarged portion 1T ot? "the pin-tle Vout of the path. of movement of the hammer arm 12, in which position ot parts the. alarm mechanism. isk free to automatically operate upon opening ot the door. Now as the door is opened, the spring 36 in assu-ming itsy normal position operates to retract the member 32, thereby moving the latter out-of engagement with the hammer arm 12 and liberating the ala-rm mechanism which instantaneously operates to sound the In Figs. 5 and 6 We show a modified` form of ther invention, which differs from. the pre.-

ferred form hereinabove described With regard to the means employed for holding the alarm mechanism inoperative when the door is in closed position. In this form ot' the invention use is made of a bracket plate identical in construction with the plate'hereinabove described. u'herein the limb 39 of which. is adapted to be secured in any suitable manner to the alarm indicated generally at A', While the limb 40 terminates to provide a right angular-ly disposed flange constituting a fixed jan1 41. Slidably fitted upon the limb- 40 is a relatively inovablerjavv' 42, which. is preferably operated by means of' a screw 43 passing through the limb 391 and having one end svviveled in the jaw 42,*Y

the opposite end of the screw being provided With a knurled nut 44, whereby the screw tray be rotated in a proper direction to move the jaw toward and away from. the fixed jaw 41 as the occasion may require. y

The alarm mechanism in this form of the invention is exactly the same as that hereim above described, and with a vieuT of rendering theY alarm mechanism inoperative when the door is in closed position, l employ a member 45y pivotcd upon the limb 39 of the bracket plate, and having one end termi natir'g in'a flange 46v for engagement with the hammer arm 12 of the4 alarm.` The opposite end of the member 45 projects beyond the limb 39 at its point. of juncture With the limb 40, and is provided. with a transverse slot 47 which receives for association therewith one end of a-n operating element 48. This element preferably consists of a flat arm slid-ably fitted upon the limb 40 andv arranged to operateV ivi-thinav groovev 4.9 in. said limb whereby the element 48 will lie flush with the surface of th-e limb 40. Arranged uithin the groove is a headed. studAV for the purpose of holding the element 48 in operati-ve position with relation to. its respective limb ofthe bracket, the element 48- being providedwith the slot 51 forthe reception of said stud whereby the elementV is: free tor slide upon thev limb.I The free. end of the operating element 48 terminates to provide a rightY angi-ilarly disposed flange 52 arranged in advance ot' the fixed jaar 4I for the purpose to be presently described; The flange 52 is normally held in spaced relation to the fixed. jaw 41 through the medium of a. spring 53l bearing upon one 'end of the member 45, which spring, also operatesjto normally lmaintain the flange 46 of Vthe mem-- ber 45 elevated and out of engagement with the hammer arm 12 of' the alarm mechanism, thereby permitting the alarm mechanism tocperate to sound an alarm, except Vwhen. the alarm mechanism isV renderedinoperative through the med-him of' the lever 2S).` However when use ot the alarm is desired the:

Vlever 29 is moved to an inoperative position` subsequent to the closing .of the'door ortho like, ivhereupon the lange 52 of the operating element 48 is brought into engagement with the door stop 5l on the door jamb B, thereby sliding the operating element 48 upon the limb l0 in a direction whereby pivotal movement is imparted to the member 45 against the tension of the spring 53, thus bringing the ange 46 of said member into engagement with the hammer arm 1Q, holding the latter-immovable and rendering the alarm mechanism inoperative as long as the door is in its closed position. Now as the door is opened, the spring 53 operates to reverse the pivotal movement of the member 45, thereby elevating the {iange 46 thereof out of engagement with the hammer arm, liberating the alarm mechanism which instantaneously operates to sound an alarm. Ot' course during this operation the operating element 48 is moved to normal position, or in other Words the ange 52 thereof is again spaced from the fixed jaw 4l. It will thus be noted that We have devised a device of the class in question which may be quickly and easily litted to any door, window or the like, and removed therefrom when desired, the device being both simple in construction and very eliieient for the purpose intended.

While it is believed that from the foregoing description the nature and advantages cf the invention will be readily apparent, we desireto have it understood that we do not fall within the scope of the appended claims.

What is claimed isz- 1. The combination with a door and jamb of an alarm bell disposed upon the door and embodying a vibratory striker. a plate movable into the path of travel ot said striker, and a spring disposed upon the edge of the door and connected with said plate, the compression of said spring between the edge of the door and the jamb urging said plate against said striker.

2. The combination with a door and jamb, of an alarm bell disposed upon the door and embodying a vibratory striker, a horizontally disposed plate guided for slidable movement Within said bell to engage the striker, the outer end of said blate being apertured, and a flat spring disposed upon the edge ot' the door and resiliently divergent therefrom and having its free end disposed Within said aperture for normally retaining said plate out of the path of travel of said striker', the compression of said spring toward the edge of the door by the jamb when the door is closed urging said plate into engagement with said striker.

In testimony whereof we aiiix our signatures. v

WILLIAM D. MOTT. LEWIS VAN BROWN.

Copies o! this patent may be obtained for five cents each, by addressing the Commissioner of Patents` Washington, D. C. 

